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A molecular ion derived from uridylic acid. It has a uracil as its base.
Vitamin B12
The existence of vitamin B12 came to light in 1926 when George Minot and William Murphy discovered that pernicious anemia, an often fatal disease of the elderly characterized by decreased numbers of red blood cells, low hemoglobin levels, and progressive neurological deterioration, could be treated by the daily consumption of large amounts of raw liver. Vitamin B12 was not isolated until 1948. This vitamin is synthesized neither by plants nor animals but only by a few species of bacteria. Humans obtain almost all of their vitamin B12directly from their diet, particularly from meat.
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